*{box-sizing: border-box;}
.rainbow{
  height: 200px;
  overflow: hidden;
}
body{
  background: white;
}
.rainbow div{
  overflow: hidden;
}
.rainbow > div {
  width: 400px;
  height: 400px;
  background: red;
  border-radius: 50%;
}
.rainbow>div>div{
  height: 380px;
  background: hsl(60,80%,50%);
  margin: 10px;
  border-radius: 50%;
}
.rainbow>div>div>div{
  height: 360px;
  background: hsl(120,80%,50%);
  margin: 10px;
  border-radius: 50%;
}
.rainbow>div>div>div>div{ 
  height: 340px;
  background: hsl(180,80%,50%);
  margin: 10px;
  border-radius: 50%;
}
.rainbow>div>div>div>div>div{
  height: 320px;
  background: hsl(240,80%,50%);
  margin: 10px;
  border-radius: 50%;
}
.rainbow>div>div>div>div>div>div{
  height: 300px;
  background: hsl(300,80%,50%);
  margin: 10px;
  border-radius: 50%;
}
  .rainbow>div>div>div>div>div>div>div{
  height: 280px;
  background: hsl(330,80%,50%);
  margin: 10px;
  border-radius: 50%;
}
.rainbow>div>div>div>div>div>div>div>div{
  height: 260px;
  background: hsl(330,80%,100%);
  margin: 10px;
  border-radius: 50%;
}
